Gorilla Koko enjoys a pumpkin tossed into his habitat at the Detroit Zoo, on Wednesday, Oct. 15, 2014 in Detroit. The zoo's inhabitants were given pumpkins and other seasonal munchies to eat, play with, tear apart, roll around in and smash. The goal is to stimulate the natural behaviors of the animals. less

Gorilla Koko enjoys a pumpkin tossed into his habitat at the Detroit Zoo, on Wednesday, Oct. 15, 2014 in Detroit. The zoo's inhabitants were given pumpkins and other seasonal munchies to eat, play with, tear ... more

In this photo provided by the San Diego Zoo, an African spotted-necked otter named Mugo examines a floating pumpkin in her exhibit this morning at the San Diego Zoo on Wednesday, Oct. 8, 2014, in San Diego. Keepers had placed pumpkins smeared with peanut butter and hollowed-out gourds with fish inside in the otter’s exhibit in Ituri Forest. less

In this photo provided by the San Diego Zoo, an African spotted-necked otter named Mugo examines a floating pumpkin in her exhibit this morning at the San Diego Zoo on Wednesday, Oct. 8, 2014, in San Diego. ... more

Photo: Ken Bohn, Associated Press

In this photo provided by the San Diego Zoo, an African... Photo-7019016.95836 - Houston Chronicle